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Electronic Parts
Failure Investigation for Electronic Parts LCD light does not come on
LCD light does not come on
Properly connect the single
light guide assy. backlight leads
to the operation U22 PCB assy.
Are the single light guide assy.
backlight leads and operation U22
PCB assy. properly connected?
N
Replace the single light guide
assy.
Is the voltage between pins 2 & 1 on
the operation U22 PCB assy. connector
(CN2) approximately 3 - 4 V?
N
Y
Connect the operation U22
PCB assy. and main NF3D
PCB assy. properly.
Are the operation U22 PCB assy. and
main NF3D PCB assy. properly
connected?
N
Y
Y
• Replace operation U22 PCB assy.
or
• Replace main NF3D PCB assy.
Summary of Contents for BLMY
Page 1: ......
Page 2: ......
Page 3: ......
Page 19: ...1 8 ...
Page 21: ...2 2 Main parts location diagram Main unit ...
Page 30: ...2 11 Disassembly Electrical parts and motors location diagram Main unit ...
Page 37: ...2 18 Thread tension mechanism location diagram Main unit ...
Page 43: ...2 24 Bobbin winder mechanism location diagram Main unit ...
Page 49: ...2 30 Needle bar presser mechanism Upper shaft mechanism location diagram Main unit ...
Page 53: ...2 34 Needle presser module breakout diagram 78 Modules ...
Page 66: ...2 47 Disassembly Feed and bobbin module breakout diagram Modules ...
Page 75: ...2 56 Thread cutter module breakout diagram Modules ...
Page 79: ...2 60 ...
Page 81: ...3 2 Needle bar presser mechanism upper shaft mechanism location diagram Main unit ...
Page 90: ...3 11 Assembly Bobbin winder mechanism location diagram Main unit ...
Page 94: ...3 15 Assembly Thread tension mechanism location diagram Main unit ...
Page 102: ...3 23 Assembly Electrical parts and motors location diagram Main unit ...
Page 109: ...3 30 Main parts location diagram Main unit ...
Page 120: ...3 41 Assembly Needle presser module breakout diagram 78 Modules ...
Page 139: ...3 60 Feed module breakout diagram Modules ...
Page 155: ...3 76 Thread cutter module breakout diagram Modules ...
Page 161: ...3 82 ...
Page 191: ...4 30 ...
Page 226: ......